Impulsive light-scattering by coherent phonons in LaAlO3: Disorder and boundary effects

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Impulsive light-scattering by coherent phonons in LaAlO3: Disorder and boundary effects

Liu, Y.; Frenkel, A.; Garrett, G. A.; Fahy, Stephen B.; Uher, C.; Merlin, Roberto; Whitaker, J. F.
Date: 1995
Copyright: © 1995, American Physical Society
Related: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.75.334
Citation: Liu, Y., Frenkel, A., Garrett, G. A., Whitaker, J. F., Fahy, S., Uher, C. and Merlin, R. (1995) ' Impulsive light-scattering by coherent phonons in LaAlO3: Disorder and boundary effects', Physical Review Letters, 75(2), 334-337 (4pp). doi: 10.1103/PhysRevLett.75.334
Published Version: 10.1103/PhysRevLett.75.334

Abstract:

Pump-probe measurements of coherent-phonon-induced changes of refractive index in LaAlO3 are dominated by normally weak boundary effects. Atomic displacements in the range 50–500 μÅ were generated and probed by femtosecond laser pulses through impulsive Raman scattering. The absence of a bulk contribution is ascribed to phase mismatch due to domain disorder. Selection rules are consistent with a Raman model considering reflection and transmission at interfaces. Intensities and phonon parameters as a function of temperature agree well with incoherent Raman data.

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